mirror of
https://github.com/caddyserver/caddy.git
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90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddy
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import (
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"os"
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"os/signal"
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"go.uber.org/zap"
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)
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// TrapSignals create signal/interrupt handlers as best it can for the
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// current OS. This is a rather invasive function to call in a Go program
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// that captures signals already, so in that case it would be better to
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// implement these handlers yourself.
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func TrapSignals() {
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trapSignalsCrossPlatform()
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trapSignalsPosix()
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}
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// trapSignalsCrossPlatform captures SIGINT or interrupt (depending
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// on the OS), which initiates a graceful shutdown. A second SIGINT
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// or interrupt will forcefully exit the process immediately.
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func trapSignalsCrossPlatform() {
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go func() {
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shutdown := make(chan os.Signal, 1)
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signal.Notify(shutdown, os.Interrupt)
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for i := 0; true; i++ {
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<-shutdown
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if i > 0 {
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Log().Warn("force quit", zap.String("signal", "SIGINT"))
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os.Exit(ExitCodeForceQuit)
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}
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Log().Info("shutting down", zap.String("signal", "SIGINT"))
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go gracefulStop("SIGINT")
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}
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}()
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}
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// gracefulStop exits the process as gracefully as possible.
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// It always exits, even if there are errors shutting down.
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func gracefulStop(sigName string) {
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exitCode := ExitCodeSuccess
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defer func() {
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Log().Info("shutdown done", zap.String("signal", sigName))
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os.Exit(exitCode)
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}()
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err := stopAndCleanup()
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if err != nil {
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Log().Error("stopping config",
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zap.String("signal", sigName),
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zap.Error(err))
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exitCode = ExitCodeFailedQuit
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}
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err = stopAdminServer(adminServer)
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if err != nil {
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Log().Error("stopping admin endpoint",
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zap.String("signal", sigName),
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zap.Error(err))
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exitCode = ExitCodeFailedQuit
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}
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}
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// Exit codes. Generally, you should NOT
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// automatically restart the process if the
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// exit code is ExitCodeFailedStartup (1).
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const (
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ExitCodeSuccess = iota
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ExitCodeFailedStartup
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ExitCodeForceQuit
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ExitCodeFailedQuit
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)
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